I find chatgpt incredibly useful for writing scripts against well-known APIs, or for a "better stackoverflow". Things like "how do I use a cursor in sql" or "in a devops yaml pipeline, I want to trigger another pipeline. How do I do that?".

But working on our actual codebase with copilot in the IDE (Rider, in my case) is a net negative. It usually does OK when it's suggesting the completion of a single line, but when it decides to generate a whole block it invariably misunderstands the point of the code. I could imagine that getting better if I wrote more descriptive method names or comments, but the killer for me is that it just makes up methods and method signatures, even for objects that are part of publicly documented frameworks/APIs.